Appearing on Europe-1 radio today, Interior Minister Claude Guéant said he feared a serial killer was behind the murders and said "maximum resources" would be used to find the perpetrator, according to the AP.

According to the Paris daily Le Figaro, Malika, a woman of Algerian origin, worked at Orly airport south of the capital and was not known to have been in trouble. The attacker fled on a motorcycle.

In a separate report, Le Figaroalso reported that ballistics were identical in all of the murders.

Grooves left by the barrel of the gun on the bullets taken from the victims’ bodies were identical and the cartridges left at the scene all bore the marks of the same firing hammer. The semi-automatic weapon was of the very common 7.65mm caliber, according to Le Figaro.